WSDL - Web Service Description Language

WSDL

• What is WSDL (Web Service Definition Language)?
• What are the different parts of a WSDL?

• Basic Structure of WSDL

Basic Structure Of WSDL

=======================

<wsdl:definitions> - The root element

<wsdl:types> - Defines XML Elements or Xml Types

<wsdl:message> - Input message, Output message, Fault message

<wsdl:portType> - Mapped with Endpoint Interface (i.e., Business Interface)

<wsdl:operation> - Mapped with method name in above Endpoint Interface

<wsdl:input/> - Refers above Input message

<wsdl:output/> - Refers above Output message

<wsdl:fault> - Refers above Fault message

</wsdl:operation>

...

</wsdl:portType>

<wsdl:binding> - Message Format, Messaging Style, Encoding Style, Transport protocol details

<wsdl:service> - Mapped with Service Interface

</wsdl:definitions>

Basic structure of <wsdl:binding>

=================================

<wsdl:binding>

<soap:binding style="doc | rpc"/>

<wsdl:operation>

<soap:operation style="doc | rpc"/>

<wsdl:input>

<soap:body/>

</wsdl:input>

<wsdl:output>

<soap:body/>

</wsdl:output>

<wsdl:fault>

<soap:fault/>

</wsdl:fault>

</wsdl:operation>

...

</wsdl:binding>

             rpc                document

   ===           ========

<soap:body Yes use="encoded | literal" Yes

   No encodingStyle="soap encoding url"          No

   Yes namespace="targetnamespace" No

   Yes parts="s1 s2" />          No

• The <soap:bidning/>, 
• <soap:operation/>, 
• <soap:body/> and 
• <soap:fault/> are protocol specific elements.
• The <wsdl:binding>, 
• <wsdl:operation>, 
• <wsdl:input>, 
• <wsdl:output> and 
• <wsdl:fault> are wsdl elements.

• WSDL:Definitions
• WSDL:Types
• WSDL:message
• wsdl:portType
• wsdl:binding
• wsdl:service
• Document  VS RPC

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• What is Contract First Approach
• • • • We define a contract first!
• With Spring Web Services, we define an XSD first

What is an XSD?

Can you give an example of an XSD?

Service Definition specifying

Format of Request

Format of Response

Request/Response Structure

Transport used

Endpoint details